| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a compact, wide-angle inter-focus lens which has compact, light-weight focusing and anti-shake groups and offers high imaging performance suitable for video shooting.SOLUTION: An inner focus lens comprises a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, and a third lens group Ghaving positive refractive power arranged in order from the object side. A negative lens Lof the first lens group Gfunctions as an anti-shake correction lens and provides anti-shake correction by moving in a direction perpendicular to an optical axis. The second lens group Gshifts focus from an object at infinity to an object at a closest distance by moving along the optical axis. A compact, wide-angle inner focus lens that supports video shooting and offers high imaging performance is realized by satisfying predetermined conditions.</p> |
